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-rw-r--r--hw/tmp105.c249
1 files changed, 249 insertions, 0 deletions
diff --git a/hw/tmp105.c b/hw/tmp105.c
new file mode 100644
index 0000000000..6d0505d2dc
--- /dev/null
+++ b/hw/tmp105.c
@@ -0,0 +1,249 @@
+/*
+ * Texas Instruments TMP105 temperature sensor.
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ * Written by Andrzej Zaborowski <andrew@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 or
+ * (at your option) version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include "hw.h"
+#include "i2c.h"
+
+struct tmp105_s {
+ i2c_slave i2c;
+ int len;
+ uint8_t buf[2];
+ qemu_irq pin;
+
+ uint8_t pointer;
+ uint8_t config;
+ int16_t temperature;
+ int16_t limit[2];
+ int faults;
+ int alarm;
+};
+
+static void tmp105_interrupt_update(struct tmp105_s *s)
+{
+ qemu_set_irq(s->pin, s->alarm ^ ((~s->config >> 2) & 1)); /* POL */
+}
+
+static void tmp105_alarm_update(struct tmp105_s *s)
+{
+ if ((s->config >> 0) & 1) { /* SD */
+ if ((s->config >> 7) & 1) /* OS */
+ s->config &= ~(1 << 7); /* OS */
+ else
+ return;
+ }
+
+ if ((s->config >> 1) & 1) { /* TM */
+ if (s->temperature >= s->limit[1])
+ s->alarm = 1;
+ else if (s->temperature < s->limit[0])
+ s->alarm = 1;
+ } else {
+ if (s->temperature >= s->limit[1])
+ s->alarm = 1;
+ else if (s->temperature < s->limit[0])
+ s->alarm = 0;
+ }
+
+ tmp105_interrupt_update(s);
+}
+
+/* Units are 0.001 centigrades relative to 0 C. */
+void tmp105_set(i2c_slave *i2c, int temp)
+{
+ struct tmp105_s *s = (struct tmp105_s *) i2c;
+
+ if (temp >= 128000 || temp < -128000) {
+ fprintf(stderr, "%s: values is out of range (%i.%03i C)\n",
+ __FUNCTION__, temp / 1000, temp % 1000);
+ exit(-1);
+ }
+
+ s->temperature = ((int16_t) (temp * 0x800 / 128000)) << 4;
+
+ tmp105_alarm_update(s);
+}
+
+static const int tmp105_faultq[4] = { 1, 2, 4, 6 };
+
+static void tmp105_read(struct tmp105_s *s)
+{
+ s->len = 0;
+
+ if ((s->config >> 1) & 1) { /* TM */
+ s->alarm = 0;
+ tmp105_interrupt_update(s);
+ }
+
+ switch (s->pointer & 3) {
+ case 0: /* Temperature */
+ s->buf[s->len ++] = (((uint16_t) s->temperature) >> 8);
+ s->buf[s->len ++] = (((uint16_t) s->temperature) >> 0) &
+ (0xf0 << ((~s->config >> 5) & 3)); /* R */
+ break;
+
+ case 1: /* Configuration */
+ s->buf[s->len ++] = s->config;
+ break;
+
+ case 2: /* T_LOW */
+ s->buf[s->len ++] = ((uint16_t) s->limit[0]) >> 8;
+ s->buf[s->len ++] = ((uint16_t) s->limit[0]) >> 0;
+ break;
+
+ case 3: /* T_HIGH */
+ s->buf[s->len ++] = ((uint16_t) s->limit[1]) >> 8;
+ s->buf[s->len ++] = ((uint16_t) s->limit[1]) >> 0;
+ break;
+ }
+}
+
+static void tmp105_write(struct tmp105_s *s)
+{
+ switch (s->pointer & 3) {
+ case 0: /* Temperature */
+ break;
+
+ case 1: /* Configuration */
+ if (s->buf[0] & ~s->config & (1 << 0)) /* SD */
+ printf("%s: TMP105 shutdown\n", __FUNCTION__);
+ s->config = s->buf[0];
+ s->faults = tmp105_faultq[(s->config >> 3) & 3]; /* F */
+ tmp105_alarm_update(s);
+ break;
+
+ case 2: /* T_LOW */
+ case 3: /* T_HIGH */
+ if (s->len >= 3)
+ s->limit[s->pointer & 1] = (int16_t)
+ ((((uint16_t) s->buf[0]) << 8) | s->buf[1]);
+ tmp105_alarm_update(s);
+ break;
+ }
+}
+
+static int tmp105_rx(i2c_slave *i2c)
+{
+ struct tmp105_s *s = (struct tmp105_s *) i2c;
+
+ if (s->len < 2)
+ return s->buf[s->len ++];
+ else
+ return 0xff;
+}
+
+static int tmp105_tx(i2c_slave *i2c, uint8_t data)
+{
+ struct tmp105_s *s = (struct tmp105_s *) i2c;
+
+ if (!s->len ++)
+ s->pointer = data;
+ else {
+ if (s->len <= 2)
+ s->buf[s->len - 1] = data;
+ tmp105_write(s);
+ }
+
+ return 0;
+}
+
+static void tmp105_event(i2c_slave *i2c, enum i2c_event event)
+{
+ struct tmp105_s *s = (struct tmp105_s *) i2c;
+
+ if (event == I2C_START_RECV)
+ tmp105_read(s);
+
+ s->len = 0;
+}
+
+static void tmp105_save(QEMUFile *f, void *opaque)
+{
+ struct tmp105_s *s = (struct tmp105_s *) opaque;
+
+ qemu_put_byte(f, s->len);
+ qemu_put_8s(f, &s->buf[0]);
+ qemu_put_8s(f, &s->buf[1]);
+
+ qemu_put_8s(f, &s->pointer);
+ qemu_put_8s(f, &s->config);
+ qemu_put_be16s(f, &s->temperature);
+ qemu_put_be16s(f, &s->limit[0]);
+ qemu_put_be16s(f, &s->limit[1]);
+ qemu_put_byte(f, s->alarm);
+ s->faults = tmp105_faultq[(s->config >> 3) & 3]; /* F */
+
+ i2c_slave_save(f, &s->i2c);
+}
+
+static int tmp105_load(QEMUFile *f, void *opaque, int version_id)
+{
+ struct tmp105_s *s = (struct tmp105_s *) opaque;
+
+ s->len = qemu_get_byte(f);
+ qemu_get_8s(f, &s->buf[0]);
+ qemu_get_8s(f, &s->buf[1]);
+
+ qemu_get_8s(f, &s->pointer);
+ qemu_get_8s(f, &s->config);
+ qemu_get_be16s(f, &s->temperature);
+ qemu_get_be16s(f, &s->limit[0]);
+ qemu_get_be16s(f, &s->limit[1]);
+ s->alarm = qemu_get_byte(f);
+
+ tmp105_interrupt_update(s);
+
+ i2c_slave_load(f, &s->i2c);
+ return 0;
+}
+
+void tmp105_reset(i2c_slave *i2c)
+{
+ struct tmp105_s *s = (struct tmp105_s *) i2c;
+
+ s->temperature = 0;
+ s->pointer = 0;
+ s->config = 0;
+ s->faults = tmp105_faultq[(s->config >> 3) & 3];
+ s->alarm = 0;
+
+ tmp105_interrupt_update(s);
+}
+
+static int tmp105_iid = 0;
+
+struct i2c_slave *tmp105_init(i2c_bus *bus, qemu_irq alarm)
+{
+ struct tmp105_s *s = (struct tmp105_s *)
+ i2c_slave_init(bus, 0, sizeof(struct tmp105_s));
+
+ s->i2c.event = tmp105_event;
+ s->i2c.recv = tmp105_rx;
+ s->i2c.send = tmp105_tx;
+ s->pin = alarm;
+
+ tmp105_reset(&s->i2c);
+
+ register_savevm("TMP105", tmp105_iid ++, 0,
+ tmp105_save, tmp105_load, s);
+
+ return &s->i2c;
+}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-18 11:23:05 +0000